Heating apparatus



A. L LA FAY.

HEATING APPARATUS.

APPLICATION msn Aue.1s. 1320.

'PatendSept 27, 1921.

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LNvENT-ma. (lyqar i UNITED STATES i AT1a1`uf*OFFICE-.fg

ARTHUR JOSEPHr LA FAY, or ToRoN'ro, oNTAmo. CANADA, AssIGNoR-OF ONE-HALFL To HUGH'Ri-TUDHorE, or o'itILLIA, ONTARIO, CANADA.

HEATING APPARATUS'. i

To all whom t may concern Beit known that I, ARTHUR J. LA FAY,V

of thej city of Toronto, in the county of York, Province of Ontario,Canada, a subject of the King of Great Britain, have invented' certainnew and useful Improvements in Heating Apparatus, of which the followingis a specification. .Y

The present invention relates to heating apparatus andthe principalobject contemplates jthe provision of means for utilizing to a maximumdegree, the caloric comprisingI the products of combustion, as anauxiliary to the heat radiatingVV function of the furnace for increasingthe efliciency of thek i Same.

A further object of the invention is to provide a heating apparatus,wherein a maX- imum amount of the caloric isderived from a givenquantity of fuel for effectively heating a given space.

In general the principle of operation ini y volved in the constructionof my improve- Figure 1 is a longitudinal sectional ele-l vation ofthe'heating apparatus embodying vtaken at the rear of Fig. 3.

ments is to Vlead the hot products of com-k bustion in a stream-movingcontinuously between an outer casing and the casing of the furnace andthen lead them through `a special flue or flues to the smoke pipe.

I attain my object by means of the constructions hereinafter morespecifically described and illustrated in the accompanying drawings inwhich.

my improvements.`

Fig. 2 is a vertical section on line 2-2 of Fig. 1 llooking in thedirection of the arings, 1 is afiuid heating furnace of ordinary Yconstruction with vertical sections, though my invention-is, applicableto furnaces of the 'horizontal sectional type.

-. it will be seen is of the type in which in- Walls of the furnace and.Surrmindng the ternalriues are provided and spacesforthe fluid to beheated externally bounded by the trolled vby the sliding damper 9.

This heater,

Specification ofLetters Patent.` Patented Sept, y27,' 1921, Applicationfiled August 1G, 1920.- i Serial No. 403,974. K i

internal yiues. 2 is the smoke collar or exit' of the furnace. Thefurnace is surrounded by' an `external casing 3 of metal or somerefractory material and preferablyl thearrangement of the externalcasing is such that the front of the boilery with its doorsisexposed.yThe external casing is preferably rectangular in planand is spaced fromthe sides and combustion into which a smoke exitA forthe furnace opens.

and 2, a chamber 4 is formed at the rear part of thefurnace and'r isseparated-.from the rear .jacket space 5 by a i partition 6. The chamberl is provided with the usual .smoke pipe-7 leading. to` the chimney.v In

the partition 6 is formed an opening 8 con- "In the space between theside walls of the furnace 1 and theexternalcasing 3are located thealternate baiiie plates 10 and 11v ypreferably of metallicconstruction.'y The plates 1() are of substantially invertedU-configuration and extendy transversely around the greater part offurnace I, the `top or arch portion 12 being secured to the innersurface ofthe top plate 13 of the casing 13.

,The verticalV leg'portions 14 of the baffle rplates 10, have edgeengagement with the In the arrangement illustrated in Figs. 1\v

Vtop of the furnace as indicated in Figs. 1. `and 2. Thespacing betweenthe external inner and youter walls of the casing 3 and furnace 1.

The lower kendsii'if the vertical leg portions of the baiiie plates 10are spacedmfrom the bed l5 vof thefurnace to providea series have theirflower ends suitably` connected, to the furnace bed 15. The plates 11,are

portions 19 of whichare connected vto the a-ngularly disposed partitionplates 20. The -upper arched portions 19 of the plates` 11 are spacedapart and form flue spaces, 21, butin other respects the'said platesareof the same f configuration as plates 10, and vserve withk paratus.

dismal/Plates ,20 in .the n mannerstated; two

fof openings 161, `17 and 18. Interposed be-j tween plates 10 are thebaflie plates 11, which formed in two sections' the. upper archedResultantof positioning the 'angularly 'i triangular return flues 22 and23 are formed the function of which will hereinafter be more fullydescribed.

4When the damper 9 is opened, the products of combustion pass upwardlythrough opening 8 into chamber 4 and out through the chimney pipe 7.

lNhen, however, it is desired to utilize the maximum caloric value ofthe products of combustion, the damper 9 is adjusted to close the exitopening 8, which action will cause the products of combustionr to bedirected into the rear jacketspace` 5, the products of combustion byreason of the closing of the damper space 8, will pass through the rearspace 16 between the furnace bed 15 and rearbaflle plate 10 and thence`will circulate upwardly in the space between the rear baiie plates 10and 11, at each side of the furnace proper. As the upper arched ends 19of baflie plates 11 are spaced apart at the top of the furnace and formthe' spaces 21, the products of combustion will pass through thesespaces 21, around the confronting edges of the said plates 11 anddownwardly into the spaces between the said plates 10 and the nextsucceeding baflie plate 10. The last mentioned plate 10 beingspaced'f'rom the Vbed provide the openings 17, through which theproducts of combustion will pass upwardly into the space betweentheyplates and the next preceding plates 11. Then the products ofcombustion pass into the space between the arched `ends 19 of the plates11 and downwardly through the space between the plates 11 andthe plate10. Upon passing through the. openings 18 at the lower endof the frontbaffiie plate 10, the products of combustion` pass upwardly intothereturn lues 22 and 23, which latter extend the entire length `of theexternal casing at the top thereof and resultantly the products ofco1nbust-ion, deprived of their caloric value, due

to their contact with the outer walls and top of the furnace, will passVinto the rear chamber '4 and out through the pipe 7 to the chimneyInthis manner, the products of combustion 1n consequence of the novelarrangey j ment of the baffle plates 10 and 11, are circulated entirelyaround the sides and top of thefurnace and consequently, the caloric yquantity is utilized to ya very marked degree.

f Byk this construction, the products of combustion. are utilized as .anvauxiliary heating .medium and coperates with the furnaceV in.developing a maximuindegree o f heat .for thegeneration of steam in thecoils.

" f and 4, I'inclose the` furnace 24 within'a'metallic external casing25 of similar con-v In vthe modification illustrated inFigs. 3

struction as that of thepreferred forni, with `the* exception thatachimney outlet collarl26 is arranged onthe top of the casing 25 casing.

baffle plates 35, within the space between` The baffle the furnace andcasing 25.

plates 34 are formed `at their upper part with arched shaped endportions 36 which extend partly over the top or crown of the furnace,and are connected to the transverse partition plates 37 and 38. Theseplates 37 and 38 are vconnected at therear to the partition 28 and thefront ends of the partitions 37 and 38, are connected to the frontbaille plates 34 and are spaced from the front wall of the The baffleplates 34 at their lower ends are spaced from the base of the furnace toprovide openings similar to openings 16, 17 and `18 of the preferredform,

whilethe baffle plates 35 havev theiri lower ends suitablyY secured tothe furnace base and extend only part way up the sides of the furnace,as illustrated in Fig. 4.

By the provision of the partitions 37 and 38 a central flue 39 is formedwhich extends from the front of the casingto the'chamber 27 at the rear.Y

When the damper 31 is open theproducts of combustion circula-te upwardlythrough opening` 30 into chamber 27 and out through the outlet collar 26to the chimney.

When the damper is closed, the products of combustion pass downwardlyfromV the smoke collar 33 into the 'jacket' space 29.

The products of combustion containing the' caloric pass through thespaces between the lower end of the rearnnostv baille plates `34 andfurnace bed and then upwardly over the tops of the short baille plates35. Thence the combustion currents pass downwardly and i "through theopening under the next pre ceding baille platel 34. This circulationiscontinued toward the front of the 4casing' and furnace, where theproducts of combustion pass up into thefront passage 410 and*Vrrearwardly*through the flue 39 to the chamber 27 'to the outletcollar26.

In this manner,.the products of combustion in its passage through thecasing, is,`by

reason of the baffle plates, is forced'to' circu-" late in channels,which bring the same in contact with the walls of the furnace proper.

Y Resultantly the caloric by. contact with the furnace walls, serves asan auxiliary heating means for the same and thus the maximum* heatingfunction of the furnace is accomplished, resulting in the fullutilization of the `products of combustion, which otherwise would belost. M 1

Likewise by the arrangement of dampers eil in the baie plates 1l, asillustrated in dotted lines in Fig. l, the products of combustion willhave unobstructed passage through the lower part of the casing and willpass upwardly and out through the top of the casing to the chimney exit.

By this novel construction a great economy of fuel is effected and thewaste products of combustion is utilized.

Should it be desired, coils could be placed in the return flues 22 and28 and the vwater circulating therethrough, will be heated byv thevproducts of combustion passing to the chimney.

The use of water coils in the manner stated, would be more particularlyadaptable, where the furnace is of the ordinary hot air type, theinterior steam or hot water coils being dispensed with.

That I claim as my invention is l. The combination with a fluid heatingfurnace of the horizontal type provided with internal iues for theproducts of combustion and spaces for the fluid to be heated externallybounded by the casing of the furnace, of an external casing spaced fromthe sidesv and top of the furnace, a smoke outlet at the end of theexternal casing, depending banp'les dividing the space between thefurnace and external casing into a plurality of vertical flues, theupper part of said baffles extending over the top of the furnace casing,a plurality of baflles alternately disposed between the first mentionedbales,

- said last mentioned baffles extending only partly across the top ofthe furnace casing and forming openings communicating with the fluespaces between the said baille plates, angularly disposed wallsextending between the top of the furnace casing and the top of theexternal casing, the said walls forming triangular shaped return fluescommunicating with the vertical flues, a chamber opening into the smokeoutlet, a jacket adapted for the reception of the products of combustionfrom the furnace, a. damper controlling the communication between thechamber and jacket, said chamber communicating with the return iiues andsmoke outlet, the upper vpart of the lirst mentionedr baffles adapted todirect the products of combustion from `the jacket to the .said returnflues and the smoke outlet.

2. The combination with a fluid heating furnace of the horizontal typeincluding internal flues for the products of combustion adapted toreceive the products of combustion from the furnace, depending bafflesdividing the space between the furnace and external casing, a pluralityof vertical flues,

the upper part of said baffles extendingV over the top of the furnace, aplurality of baffles interposed between the rst baffles and having theirupper end extending partly across the top of said furnace, angularlydisposed walls arranged in the upper end of said casing and formingreturn flues communicating with the vertical flues at the front of thecasing, and said chamber and the upper ends of said baffles beingconnected to said walls, and said baiies being adapted to direct theproducts of combustion from the jacket to the return flues.

3. The combination with a fluid heating furnace, of an external casingspaced from the sides and top of the furnace, the space between the rearend of the furnace and casing forming a chamber and jacket, a damperconnection between said chamber and jacket, an outlet connection leadingfrom the chamber, said jacket adapted for the reception nace, aplurality of baffle plates arranged in the space between the sides andtop of the A casing and the furnace, baille plates disposed alternatelybetween the rst mentioned plates, and forming vertical flues, the secondmentioned plates having their upper ends extending only partly over thefurnace top, the lower ends of said plates extending to the furnace bed,and the lower ends of the other of said baliie plates being spaced fromthe vfurnace base, a pair of angularly disposed plates secured to theupper end of said casing and forming triangular shaped flues extendingacross the top of said casing, the said llues communicating with theforward vertical iues formed at the front of the casing and with thesaid chamber and the said baffle plates being adapted to direct theproducts of combustion from the jacket to the return flues and into thesaid chamber and outlet.

Signed at Toronto, Canada, of August, 1920.

ARTHUR JOSEPH LA FAY,

this 9th day

